Hi I am trying to create a chrome extenstion,For making my app to extenstion I am following this steps,

1.Go to chrome option -> More tools -> Extension.

2.I selected the developer mode in that window.

3.I selected the unpacked extention then selected my app.

4.I clicked Pack extension.

In my application I have few html pages,CSS,JS and manifest file and background.js.

manifest file

{
    "name": "...",
    "description": "........",
    "manifest_version": 2,
    "minimum_chrome_version": "23",
    "version": "0.1.1",
    "offline_enabled": true,
    "icons": {
        "16": "sample.png"  
    },
    "permissions": [
    "storage","tabs","","webview"
    ],
    "app": {
        "background": {
            "scripts": ["background.js"]
        }
    }
}

background.js

chrome.app.runtime.onLaunched.addListener(function() {
  chrome.app.window.create('login.html', {
    id: 'main',
    bounds: { width: 1024, height: 768 }
  });
});

While Including permissions for tab I am getting th e following warning,

There were warnings when trying to install this extension:
'tabs' is only allowed for extensions and legacy packaged apps, but this is a packaged app.

My app is not considered as a extension.And I am trying this for page navigation. I usually use window.location.href="sample.html" in jquery. For this I am getting a error in my chrome extension,

Use blank _target

Then I tried using this line of codes,

function clickHandler(e){
  chrome.tabs.update({url:"service1.html"});
  window.close();
}
document.addEventListener('DOMContentLoaded',function(){
  document.getElementById('click-me').addEventListener('click',clickHandler);
});

This snippent of code is also not working.Can some one please help me to make my app a extension and help me in page navigation.Thanks in advance.